Answer to Q70
[3,42,1] [5,82,3] [6,84,2] [4,x,1]. What is x?
[A,B,C]: B = (A+C)(A-C)
[3,42,1] (3+1)(3-1) = 42
[5,82,3] (5+3)(5-3) = 82
[6,84,2] (6+2)(6-2) = 84
[4,x,1] x = (4+1)(4-1) = 53
Answer: 53
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